Hi,

I've modified `gnus-button-alist'.  It now makes buttons for CTAN-URLs
(quite often seen in LaTeX related groups) and for
apropos-documentation:

| CTAN: macros/latex/contrib/supported/koma-script/
| M-x apropos-documentation RET buttons RET

Some other regexps in `gnus-button-alist' were changed too.  

Some of the regexps use [a-zA-Z].  But gnus-article-add-buttons set
case-fold-search to t.  Is this indented? (I didn't change this.)

Here's the patch and a ChangeLog entry:

--8<---------------cut here---------------start------------->8---
2002-12-30  Reiner Steib  <Reiner.Steib@gmx.de>

	* gnus-art.el (gnus-button-valid-fqdn-regexp): New variable.
	(gnus-button-handle-apropos-documentation): New function.
	(gnus-button-handle-ctan): New function.
	(gnus-button-alist): Use them.  Improve some regexps.
	(gnus-button-prefer-mid-or-mail): Addition to doc-string.

--8<---------------cut here---------------end--------------->8---